TY - JOUR
T1 - First Direct Mass Measurements of Nuclides around Z=100 with a Multireflection Time-of-Flight Mass Spectrograph
AU - Ito, Y.
AU - Schury, P.
AU - Wada, M.
AU - Arai, F.
AU - Haba, H.
AU - Hirayama, Y.
AU - Ishizawa, S.
AU - Kaji, D.
AU - Kimura, S.
AU - Koura, H.
AU - Maccormick, M.
AU - Miyatake, H.
AU - Moon, J. Y.
AU - Morimoto, K.
AU - Morita, Kosuke
AU - Mukai, M.
AU - Murray, I.
AU - Niwase, T.
AU - Okada, K.
AU - Ozawa, A.
AU - Rosenbusch, M.
AU - Takamine, A.
AU - Tanaka, T.
AU - Watanabe, Y. X.
AU - Wollnik, H.
AU - Yamaki, S.
N1 - Funding Information:
We express gratitude to the Nishina Center for Accelerator-based Research at RIKEN and the Center for Nuclear Science at the University of Tokyo for their support during the online experiments. This work was financially supported by the Japan Society for the Promotion of Science KAKENHI (Grants No. 2200823, No. 24224008, No. 24740142, No. 15H02096, No. 15K05116, and No. 17H06090).
Publisher Copyright:
© 2018 authors. Published by the American Physical Society.
PY - 2018/4/10
Y1 - 2018/4/10
N2 - The masses of Es246, Fm251, and the transfermium nuclei Md249-252 and No254, produced by hot- and cold-fusion reactions, in the vicinity of the deformed N=152 neutron shell closure, have been directly measured using a multireflection time-of-flight mass spectrograph. The masses of Es246 and Md249,250,252 were measured for the first time. Using the masses of Md249,250 as anchor points for α decay chains, the masses of heavier nuclei, up to Bh261 and Mt266, were determined. These new masses were compared with theoretical global mass models and demonstrated to be in good agreement with macroscopic-microscopic models in this region. The empirical shell gap parameter δ2n derived from three isotopic masses was updated with the new masses and corroborates the existence of the deformed N=152 neutron shell closure for Md and Lr.
AB - The masses of Es246, Fm251, and the transfermium nuclei Md249-252 and No254, produced by hot- and cold-fusion reactions, in the vicinity of the deformed N=152 neutron shell closure, have been directly measured using a multireflection time-of-flight mass spectrograph. The masses of Es246 and Md249,250,252 were measured for the first time. Using the masses of Md249,250 as anchor points for α decay chains, the masses of heavier nuclei, up to Bh261 and Mt266, were determined. These new masses were compared with theoretical global mass models and demonstrated to be in good agreement with macroscopic-microscopic models in this region. The empirical shell gap parameter δ2n derived from three isotopic masses was updated with the new masses and corroborates the existence of the deformed N=152 neutron shell closure for Md and Lr.
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U2 - 10.1103/PhysRevLett.120.152501
DO - 10.1103/PhysRevLett.120.152501
M3 - Article
C2 - 29756864
AN - SCOPUS:85045350542
SN - 0031-9007
VL - 120
JO - Physical review letters
JF - Physical review letters
IS - 15
M1 - 152501
ER -